Pathogen-driven forest diversity
Article Abstract:
Research undertaken in a black cherry forest near Bloomington, IN, has considered why some forests are more heterogeneous than others with regard to the tree species they contain. It was established that, because a particular soil pathogen lives on the roots of mature black cherry trees, the dispersal of black cherry seeds away from their parents is vital for the creation of saplings. It seems that the aggressiveness of soil pathogens gives little, if any, chance for the selection of pathogen-resistant host plant genotypes. Escape by dispersal may be the best solution for plants in their battle with soil pathogens, which do not disperse as readily as above-ground pathogens.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
Soil pathogens and spatial patterns of seedling mortality in a temperate tree
Article Abstract:
The Janzen-Connell mechanism functions within temperate forests, according to research investigating whether negative plant-soil feedback was taking place in Prunus serotina (black cherry). Demographic censuses were carried out beneath six focal black cherry trees from 1996 to 1998. It was found that mean distance to parent of survivors was substantially greater than that of germinating seedlings for 1996 and 1998 cohorts. Only heterospecific adults arose within the arcs, indicating that mortality attributable to soil pathogens favours heterospecific recruitment regardless of the high level of black cherry seed dispersal.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
Fungi and the food of the gods
Article Abstract:
According to recent findings, a group of microbes known as 'endophytes' fungi provide their host plants with an effective defense against pathogens. The report on the endophytes and the disease incidence in cacao trees is reported.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Defence by diversity. Fusion potential for vaccines
- Abstracts: The evolution of warning signals. Ins and outs of the ribosome. Genetic control and evolution of sexually dimorphic characters in Drosophila
- Abstracts: Bad news for sea otters. Romancing the glades. Duckville, U.S.A
- Abstracts: A birder's mecca: one of South Africa's hottest spots . To the rescue: penguin rehab. Baboon reunion
- Abstracts: Single crystals of an ionic anthracene aggregate with a triplet ground state. Suppression of crystal nucleation in polydisperse colloids due to increase of the surface free energy